A condition that unfavorably affects the normal functioning of the body and/or mind is called

A Disease
B Reaction
C Asymptomatic
D Lymphatic

I think it's important for the crabs to be preserved because many other species rely on them for food already. It's bad enough birds, and other animals munch on them but humans are making it worse. An environmental condition affecting the population of these crabs are roads, and houses, they block crabs from going to beach.